Effects of the axial magnetic field component on the electron trajectory in the wiggler section

1998 ◽  
Vol 34 (5) ◽  
pp. 3467-3470
Author(s):  
A.C.C. Migliano ◽  
A.C.J. Paes ◽  
Y.C. De Polli ◽  
C.R.S. Stopa ◽  
J.R. Cardoso
Keyword(s):  
Magnetic Field ◽  
Field Component ◽  
Axial Magnetic Field ◽  
Magnetic Field Component ◽  
Electron Trajectory

scholarly journals MHD aspect of current sheet oscillations related to magnetic field gradients

2009 ◽  
Vol 27 (1) ◽  
pp. 417-425 ◽  
Author(s):  
N. V. Erkaev ◽  
V. S. Semenov ◽  
I. V. Kubyshkin ◽  
M. V. Kubyshkina ◽  
H. K. Biernat
Keyword(s):  
Magnetic Field ◽  
Current Sheet ◽  
Field Component ◽  
Short Wave ◽  
Magnetic Field Component ◽  
Wave Number ◽  
Dispersion Function ◽  
Small Scale ◽  
Magnetic Field Gradients ◽  
Normal Magnetic Field

Abstract. One-fluid ideal MHD model is applied for description of current sheet flapping disturbances appearing due to a gradient of the normal magnetic field component. The wave modes are studied which are associated to the flapping waves observed in the Earth's magnetotail current sheet. In a linear approximation, solutions are obtained for model profiles of the electric current and plasma densities across the current sheet, which are described by hyperbolic functions. The flapping eigenfrequency is found as a function of wave number. For the Earth's magnetotail conditions, the estimated wave group speed is of the order of a few tens kilometers per second. The current sheet can be stable or unstable in dependence on the direction of the gradient of the normal magnetic field component. The obtained dispersion function is used for calculation of the flapping wave disturbances, which are produced by the given initial Gaussian perturbation at the center of the current sheet and propagating towards the flanks. The propagating flapping pulse has a smooth leading front, and a small scale oscillating trailing front, because the short wave oscillations propagate much slower than the long wave ones.

Study on the Film Coating Methods on Inner Surface of Long-Straight Tubes

2011 ◽  
Vol 88-89 ◽  
pp. 481-485 ◽  
Author(s):  
Shi Wei Zhang ◽  
Yong Chao Han ◽  
Jin Han
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Magnetron Sputtering ◽  
Axial Magnetic Field ◽  
Film Coating ◽  
Electron Trajectory ◽  
Gas Flows ◽  
Solenoid Coil ◽  
Inner Surface ◽  
Coating Methods

In this paper, a variety of previous coating methods are reviewed for the film coating on the inner surface of long-straight tubes. A new magnetron sputtering method is introduced for the film coating in the thin and long tubes made by the conductive and non-magnetic material. The coating process of this method is as follow: the long rod target connecting the cathode is penetrated in center of the coated tube connecting the anode; a solenoid coil with DC exciting current is set outside of the tube so the steady axial magnetic field is generated in the ring discharge area between target and the tube; the working gas flows through the tube from one end to the other, the gas discharge and the magnetron sputtering coating occures in the region corresponding to the solenoid coil; the homogeneous film is obtained on the whole inner surface of the tube when the solenoid coil moves along the tube. The principle and structure of the coating system are analyzed. The distribution of electromagnetic field and electron trajectory in the electromagnetic field are calculated within the discharge region. And distribution of the magnetic field is simulated by COMSOL multiphysicsn software.

scholarly journals Magnetopause current as seen by Cluster

2005 ◽  
Vol 23 (3) ◽  
pp. 901-907 ◽  
Author(s):  
M. W. Dunlop ◽  
A. Balogh
Keyword(s):  
Magnetic Field ◽  
Electric Current ◽  
Large Scale ◽  
Field Component ◽  
Accurate Determination ◽  
Field Measurements ◽  
Magnetic Field Component ◽  
Boundary Crossing ◽  
Current Layer

Abstract. The four-spacecraft, magnetic field measurements on Cluster can be combined to produce an accurate determination of the electric current in the magnetopause boundary during stable magnetopause crossings. For events that are planar on the scale of the spacecraft configuration, the thickness of the current layer can be accurately estimated from its magnetic profile at each spacecraft and the corresponding boundary crossing times. The latter, give a determination of boundary motion relative to the Cluster array. We use the estimates of all these properties, for a range of spacecraft separation distances, to show, firstly, that the estimate of electric current density is representative even when the spatial scale of the configuration of Cluster spacecraft approaches the thickness of the current layer. Secondly, we show that the estimated current lies in the plane of the boundary and demonstrate this for crossings occurring during large-scale ripples on the magnetopause. Thirdly, we show that the magnitude of the current is accurately represented, averaged over the extent of the current layer, by comparing to the change in the boundary-parallel magnetic field component divided by the estimated current layer thickness. We demonstrate this last point using a range of crossings each having a different thickness and crossing speed, different changes in the magnetic field component and different current densities.

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